Adding Underscore.js map

To remove a JS error on the page
Adding Grunt, for JS compilation
Adding Underscore.js map to the raw folder too

Missed in the previous commit
Adding Grunt Config for JS minification
Updating instructions for grunt usage
More grunt config files
Add Third Level Filtering
Add wildcard search on typing
Merge remote-tracking branch 'origin/newFacetSearch' into dev

Conflicts:
	_site_generated/assets/css/all.css
	_site_generated/assets/js/all.js